Frame for a bicycle



FIG. 1 is a front/right-side/top perspective view of a frame for a bicycle showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear-side view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

CLAIM I claim the ornamental design for a frame for a bicycle, as shown and described. 